<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>学习表格</title>
</head>

<body>
    <table>
        <tr>
            <td>100</td>
            <td>66</td>
        </tr>
        <tr>
            <td>55</td>
            <td>33</td>
        </tr>
    </table>
    <table>
        <tr>
            <th></th>
            <th scope="col">周六</th>
            <th scope="col">周日</th>
        </tr>
        <tr>
            <th scope="row">单价</th>
            <td>7.98RMB</td>
            <td>8.66RMB</td>
        </tr>
        <tr>
            <th scope="row">销售额</th>
            <td>100件</td>
            <td>60件</td>
        </tr>
    </table>
    <table>
        <thead>
          <tr>
            <th>姓名</th>  <!-- 默认加粗居中，无下划线 -->
            <th>年龄</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td>张三</td>
            <td>25</td>
          </tr>
        </tbody>
      </table>
</body>


</html>